Toy building block



FIG. 1 is a perspective view of the toy building block in accordance with my design;

FIG. 2 is a front view of the toy building block shown in FIG. 1;

FIG. 3 is a top view of the toy building block shown in FIGS. 1-2;

FIG. 4 is a bottom view of the toy building block shown in FIGS. 1-3;

FIG. 5 is a right side view of the toy building block shown in FIGS. 1-4; and,

FIG. 6 is a left side view of the toy building block shown in FIGS. 1-5. 

CLAIM The ornamental design for a toy building block, as shown and described. 